[gstreamer-bugs] [Bug 570215] New: v4l2src captures non complete images off webcam

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-good | Ver: 0.10.18
           Summary: v4l2src captures non complete images off webcam
           Product: GStreamer
           Version: 0.10.18
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: t.j.pinkert at alumnus.utwente.nl
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: 2.21/2.22
   GNOME milestone: Unspecified


Please describe the problem:
I have had several webcams attached to my computer using v4l2src and all of
them have the same problem with gstreamer, the image is only half captured. the
rest of the image is then filled with the last captured line of video.

It seems to me like a buffer issue or some initialisation issue, because at
640x480 approx. 1/4 of the image is captures correctly, at 320x240 approx. 1/2
of the image is captured and then at 160x120 the complete image is shown.

The webcams are:
- Philips PCVC740K ToUcam Pro (via pwc module)
- Logitech QuickCam Deluxe (via uvcvideo module)
- Philips SPC620 NC (via uvcvideo module)

Steps to reproduce:
I ran all of this with the following command:
$ gst-launch-0.10 v4l2src device=/dev/video2 ! video/x-raw-yuv, width=640,
height=480 ! xvimagesink


Actual results:


Expected results:


Does this happen every time?
As far as I've seen this behaviour is reproducable and happens all the time.

Other information:
At least the Philips PCVC740K ToUcam Pro produces good video with the
'camstream' application. The other webcams are not producing nice video through
the 'luvcview' application and seem to have the same error there. (So that
makes me wonder if this is really a gstreamer bug or if it occurs somewhere in
V4l2)


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